When Hansel and Gretel first arrive at the candy witch's lair as children, Gretel pulls off the end of one of the icing icicles to eat it. In the next few shots, the icicle is shown as intact when it should have a blunted end.
At the beginning of the movie when Hansel and Gretel are fighting the witch in the woods Hansel grabs the witch and slams her down on a log behind him. When the witch starts to back away from Hansel the log is in two parts with about 2 to 3 feet between pieces. In the very next shot the log pieces are almost touching with a thin gap. As Gretel locks the witch in place in the air the log is back to a wide gap of 2 to 3 feet.
When Gretel is attacked by the sheriff and his men, she's wearing a leather jacket over her vest and blouse. Once Edward saves her, she rolls over to see him going after the sheriff, and her jacket is gone.
When Ben shoots Muriel, he tells Hansel and Mina, "I got her! I shot Muriel!" But he has never seen Muriel before and no one besides Gretel (who was told by Edward) knows that the grand witch's name is Muriel. Hansel does not know the grand witch's name either, but acts like he does.